I like his idea. Don't mean to scare you or anything but I had the same noise on my old car (probe) and it was because I blew out my cat. And the rattling was the pieces vibrating inside the resonator. But if you dont have a CEL you better off than I was.

2000 SVT Black/Tan #1633/2150 (a few mods) Alpine: CDA-9835, MRV-F540, MRD-M550 PG: TANTRUM-X 6.5 COMP all around. Some people wear Superman pajamas. Superman wears Chuck Norris pajamas. CEL currently: Off